First, thanks to everyone who's helped me as I clean up my 1990 turbo FC3.
It's so amazing how much knowledge is needed, and then freely shared on this forum.
I'm taking pics as I go along to hopefully one day get a writeup or two into the archives for other S5 turbo owners cleaning up their engine bays.

Now the questions:
When picking up parts for my '90 turbo, i faced off with:
1. Stainless or "hardened- (Stamped either 8.8 or 12.9)" nuts for the downpipe studs? Lockwashers?

2. Karropak, Cork, or Rubber-Fiber for a home-cut paper gasket placed under an ACV block-off plate?

3. Does anything need to be placed inside Vacuum-Nipple-Caps when capping?

4. I've got Permatex High-Temp (to 1600F) anti-sieze. Good for the exhaust downpipe studs?

5. I live in florida, and there are no emissions tests here. Aside from destroying the environment, are there ANY after-effects of removing the airpump, ACV, installing a blockoff plate, capping any line open after that, and then routing vac to the pressure sensor? (from the nipple behind the BAC valve)
Bad Idle, backfiring, etc?

Thanks again, I appreciate any answers-
steve

 

1. stainless ftw. for dp, i don't think you're going to get any sort of advantage with hardened nuts, and this will make any possible removal/maintenance much easier w/o any rust on them

5. if you keep bac, i think you're going to be just find, and you're going to enjoy better performance as well as better fuel economy